A purine salt of the formula
wherein Y₁ is chloro, bromo, or iodo, and R₁, R₂, R₃, and R₄ are independently selected from alkyl and substituted alkyl is reacted with the compound of the formula
Z₁―X
to yield the purine of the formula
wherein X is a leaving group, and Z₁ is a protected form of the carbohydrate surrogate Z. Several routes are disclosed for converting this intermediate to the antiviral agent
式中的
嘌呤盐
其中 Y₁ 是
氯、
溴或
碘,且 R₁、R₂、R₃ 和 R₄ 独立选自烷基和取代烷基的
嘌呤盐与式中的化合物反应
Z₁-X
与式 Z₁-X 的化合物反应,生成式 Z₁-X 的
嘌呤
其中 X 是离去基团,Z₁ 是
碳水化合物代用品 Z 的保护形式。